350-401 Question #1120: Real Exam Question with Answer & Explanation

Question

Lab Simulation 14 Guidelines This is a lab item in which tasks will be performed on virtual devices. - Refer to the Tasks tab to view the tasks for this lab item. - Refer to the Topology tab to access the device console(s) and perform the tasks. - Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window. - All necessary preconfigurations have been applied. - Do not change the enable password or hostname for any device. - Save your configurations to NVRAM before moving to the next item. - Click Next at the bottom of the screen to submit this lab and move to the next question. - When Next is clicked, the lab closes and cannot be reopened. Topology Tasks OSPF is partially configured. Complete the OSPF configurations to achieve these goals: 1. Configure R3 and R20 so they do not participate in a DR/BDR election process in Area 20. 2. Configure R10 so it is always the DR for Area 10. Do not change the router ID. Answer: Task 1. Configure R3 and R20 so they do not participate in a DR/BDR election process in Area 20. Area 20 only has two routers so if we use "ip ospf priority 0" command on them (so that they do not participate in DR/BDR election process) then the OSPF process may fail as there is no DR/BDR to process OSPF packets. A better solution is to set OSPF network type to point-to- point. On R3: R3(config)#interface e0/1 R3(config-if)#ip ospf network point-to-point On R20: R20(config)#interface e0/0 R20(config-if)#ip ospf network point-to-point Make sure the election is reset on both routers: R3#,R20#clear ip ospf process Reset all OSPF processes? [no]: y Verification On both R3 and R20 use the "show ip ospf neighbor" command, we will see both neighbors show the "DROTHER" state. For example on R3: R3#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface ... 10.2.203.20 0 FULL/- 00:00:10 10.2.203.20 Ethernet0/1 Note: We should check the "Address" field (as the "Neighbor ID" field does not show what is the router clearly) to identify the neighbor. In the above output, from the "Address" field of 10.2.203.20, we can identify this is R20. Task 2. Configure R10 so it is always the DR for Area 10. Do not change the router ID. We can configure R10 to be the DR with highest OSPF priority value: R10(config)#interface e0/0 R10(config-if)#ip ospf priority 255 Make sure the election is reset on R2 & R10: R2#,R10#clear ip ospf process Reset all OSPF processes? [no]: y Verification On R2 use the "show ip ospf neighbor" command, we will see R10 (with "Address" field of 10.1.102.10) shows the "DR" state. Save the configuration We changed the configuration on R3, R10 and R20 so we need to save the configuration on all of them: R3#,R10#, R20# copy running-config startup-config

Options

• taskOSPF is partially configured. Complete the OSPF configurations to achieve these goals: 1. Configure R3 and R20 so they do not participate in a DR/BDR election process in Area 20. 2. Configure R10 so it is always the DR for Area 10. Do not change the router ID.
• prerequisitesConsole access is available for all required devices (R2, R3, R10, R20). All necessary preconfigurations have been applied.